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Broadleaf Weed Control in Sugarcane
Curtis Rainbolt
Sugarcane Extension Agent
Spiny pigweed
• Most common pigweed species– Stickerweed
• Large, upright growth habit, entire leaves• Very evident spines located at nodes
Alligatorweed
• Common in many areas of the EAA– Prefers wet areas– Often spread by
cultivation– Low growing
• Hollow stems when growing in wet spots
• Opposite leaves• Small white blooms
Common lambsquarters
• Common some years– Usually during the cooler months (Dec, Jan)– Can be difficult to control
• Waxy leaf surface• Alternate leaves• Medium size lobes on leaves
Common purslane
• Very common– Probably not
competitive– Prostrate growing– Succulent– Leaves small,
smooth, opposite or alternate
– Red stems– Controlled by most
herbicides
Common ragweed
• Often found on ditch banks and field edges– Deeply dissected leaves– Many hairs on upper and
lower surfaces– Long seedhead at top of plant– Yellow flowers
Ragweed parthenium
• Primarily ditchbanks– Less common than common ragweed– Leaves less deeply dissected
• Divisions don’t go all the way to the stem
– White flowers• Single, not multiples
Dayflower
• Common in open areas, field edges– Small, probably not
competitive– Prostrate growth habit– Parallel veins on leaves
• Actually a monocot, not a dicot
– Blue flowers
American black nightshade
• Occasional weed in EAA– Problematic in vegetables
(tomato, pepper)• Same family (Solanaceae)• Resistant to paraquat in some
areas
– Alternate leaves• Usually entire to somewhat
lobed
– Purple fruit– Competitive
2,4-D Amine
• Very versatile, useful product
• Controls most broadleaves
• Can use lower rates on smaller weeds
• At higher rates (2 lb ai) very good control of alligatorweed
• Coverage is the key to good alligatorweed control
Atrazine• Backbone of sugarcane weed control
– Used both PRE and POST• PRE
– Good soil activity (2-4 qt/A)
– Controls most broadleaves
– Suppress/control many grasses
– Activity begins to fade 3-5 weeks after application
– Broadleaf activity last longer than grass activity
Diuron(Karmex/Direx/Etc)
• Not used much– Sand soils (binds very strongly on muck)– Better control of broadleaves than grass– Not much experience
• Crop injury?
• Rate– 1.6 lb/A PRE
Envoke
• Excellent control of alligatorweed
• Partial (slow acting) control of prostrate pigweeds
• Partial control of Dayflower
• Does not control American Black Nightshade or related species
Evik (Ametryn)
• Generally applied POST– Some is applied PRE
• Controls many small grasses and broadleaves– Weeds need to be less than 4 inches– Directed application
• Injury will be seen on treated foliage